How does one delink your bank from Quick books?

Thanks for posting to the Community, @jamesvanoudtshoo.

You can edit the bank account info for you to disconnect the linked bank account.

Let me show you how:

1. Go to Banking on the left pane and then select Banking.
2. Choose the bank account and click the Pencil icon.
3. Select Edit account info.
4. Check Disconnect this account on save box.
5. Click Save and Close.

For more details and information about deleting bank and other types of accounts, you can check this article: Delete an account on your chart of accounts in QuickBooks Online.

Please keep me notified by leaving a message through this post if you need further assistance. I'm always here to help. Enjoy your day!